IDA pro将操作数转换为偏移量（代码段）（Convert operand to offset (code segment)）

Action    name: OpOffsetCs

This command converts the immediate operand of the current instruction/data to an offset from the current segment (CS).
If the cursor is on the first operand (the cursor is before ',') then the first operand will be affected; otherwise, all other operands will be affected.

If a range is selected using the anchor, IDA will perform 'en masse' conversion. It will convert immediate operands of all instructions in the selected range to offsets. However, IDA will ask you first the lower and upper limits of immediate operand value. If the operand value is >= lower limit and <= upper limit then the operand will be converted to offset, otherwise, it will be left unmodified.

If this command is applied to a structure member in the structure window, then IDA will create an "automatic offset". An automatic offset is an offset with the base equal to 0xFFFFFFFF. This base value means that the actual value of the base will be calculated by IDA when a structure instance is created.

To create offsets to structure members, use Convert to struct offset command.

See also:

         offset by data segment/no offset
         offset by any segment
         offset by any user-specified base
         Edit|Operand types|Offset submenu.
         Enter #th operand manually commands.
         Set operand type

中文翻译：

操作名称：OpOffsetCs
此命令将
当前指令/数据的立即数操作数转换为当前段（CS）的偏移量。

如果光标在第一个操作数上（光标在“，”之前），则第一个操作数会受到影响；否则，所有其他操作数都将受到影响。

如果使用锚点选择了一个范围，IDA将执行“整体”转换。它将把所
选范围内的所有指令的立即数转换为偏移。然而，IDA将首先询问即时操作数值的下限和上限。如果操作数值为>=下限和<=上限，则操作数将转换为偏移量，否则将保持不变。

如果将此命令应用于结构窗口中的结构成员，则IDA将创建一个“自动偏移量”。自动偏移是指以等于0xFFFFFFFF为基数的偏移。此基值意味着，在创建结构实例时，IDA将计算基的实际值。

要创建结构成员的偏移量，请使用“转换为结构偏移量”命令。

另请参阅：按数据段偏移量/
按用户指定的基的任何段偏移量无偏移量编辑|操作数类型|偏移量子菜单。
手动输入第#个操作数命令。设置操作数类型